To quote Ron Burgundy:
I'm not even mad, that's amazing
Like, there's a good chance that this leads to us discovering a "secret" nuke test, it would almost be worst case scenario if this "just happened".
C-137 doesn't just fucking happen, it and S-90 are fission byproducts.
Either someone tested a nuke in the ocean, or there's somehow fission happening somewhere in the ocean without human involvement.